Support for resistance elements



p 1930. P. P. PIPES SUPPORT FOR RESISTANCE ELEMENTS Filed March 23. 1927SIIQCIIrCl PL/NY P PP:

Patented Sept. 9, 1930 UNITED STATES PATENT OFFICE ILIN'Y P. PIPES, OFIANSI'IELD, OHIO, ASSIGNOB TO THE OHIO BRASS comm, OI MANSFIELD, OHIO, ACORPORATION OF NEW JERSEY smear iron ansrs'rmcn EL M Application filedlarch 23, 1927. Serial I0. 177,641.

My invention relates to a resistance unit, and is particularly adaptedfor use in connection with the construction of ortable electric weldingmachines due to its light 3 construction, ease of repair andcompactness,

although it may also be used with other devices requiring resistanceunits or elements. My invention resides in the new and novelconstruction, combination and relation of the various parts more fullydisclosed and described hereinafter.

In the accompanying drawing:

Fig. 1 is a plan view of my invention.

Fig. 2 is an end view of the same.

Fig. 3 is a side view of one of the side plates used in pairs.

Fig. 4 is an edge view of Fig. 3, looking toward the inner edge.

Fig. 5 is aside view of one of the intermediate insulating elements.

Fig. 6 is an edge view of Fig. 5.

Fig. 7 is a side view of the end insulatingelements.

Fig. 8 is an edge view of Fig. 7.

2 F i 9 shows a section of a modified shape whic can be used for thatshown in Fig. 4.

In the preferred embodiment of my invention, I employ two supportingbars 1 made of metal preferablyg althou h insulating ma terial, such asfi r, may employed, if desired, and these bars are spaced a art andprovided with notches 2 at the en which may hook over bolts, pins, etc.,in the supporting frame of the machine to which 1t 1s applied to assistin the assembly of the umts in the frame.

Secured to the supportin bars 1 are the supports for the resistance eements 4 and 5. The resistance elements may consist of one or moresections, and in this case I have shown two sections 4 and 5, havingterminals 4' and 4 and 5 and 5" respectively.

The resistance elements 4 and 5 I have shown as com rising wire,helically or spiral- 1y wound, w 'oh gives a large resistance capacityfor a given space occu led, and 1s easy and convenient to handle. achlength of resistance element across the device can be a separate unitconnected at the end, but

I prefer to make the elements continuous in plates and secure the sideplates in length as far as possible, thereby eliminatmg possible pointsof trouble where the le t s are connected together.

ach resistance support comprises two side plates 3 which may be formed uout of sheet metal, such as steel or iron wit a ortion 6 and projections7 extending at rig t an les to the portion 6 and projections 8 exten 'nat right an les to the portions 7, and eac projection provided with ahole 9. The portion 6 is provided with inwardly projecting, spaced andoppositely disposed lips 10, formin a groove therebetween along theinner ace of the portion 6 to receive and hold the insulating blocks 11and 12. If desired, the opposite edges of the ortion 6 may be turnethroughout its lengt to form a groove.

The side plate may be formed u out of a small channel, if desired. Thear 1 is provided with transverse holes, which are adapted to receive thescrews or small bolts 13, which pass through the holes 9 in the sidesition on the supporting bars 1 and dispose on opsite si es thereof. Thetwo side plates orm a frame on which are mounted the insulating blocks11 and 12.

. The insulating block 12 is made of glass, rcelain or, preferably,clay, which has been red, and is of a shape which, I find, will permitof close spacing of the coils of the resistance elements 4 and 5 andallow ample space between the coils or la ers of the resistance elementsto permito circulation of air to keep down the temperature of theresistance elements.

Each insulating block consists of two portions 14 and 15 on oppositesides of the center line X-X. The upper and lower edge faces of theportions 14 and 15 are steppe or offset or out of alinement with thecorres ondin face of the other ortion and in t e bloc shown in Fig. 5 te upper edge face of the portion 15 coincides with the transverse lineA-A which is midway of the portion 14, and the lower face of the rtion14 is on the transverse line B-B, w ich is midway of the portion 15. I

It will be noted that the members 6, 7

and 9 hold the insulating blocks against lateral, longitudinal andtransverse displacement respectively.

This construction permits of two blocks being placed edge to edge, asshown in Fig.2, and the adjacent faces are provided with semi-grooves 16which, cooperating with similar grooves on'the cooperating block form asubstantially circular groove, in which rests the resistance elements 4and 5, and the surface formin the grooves are convexed so as to offer aslittle contact with the resistance coils as possible and thereby givingbetter cooling effect and less danger of hot-spots in the coils.

Any number of blocks may be assembled in the groove formed in thesupporting side plates, and in order to make use of the semigrooves 16in the upper andlower faces of the end blocks, as assembled in the sideplates, I

employ a form of insulating block 12 shown in Fig. 7, which is similarto that shown in Fig. 5, excepting that the lower part of the portion 15below the line BB is removed and the rooves 17 cooperate with thegrooves 16 to ma e complete retaining grooves for the resistanceelement. I

The construction and assembly of the insulating blocks 11 and 12 is suchas to produce orifices to receive the resistance elements in spacedrelation to each other, both horizontally and vertically.

From the construction shown and described, it will be readilyappreciated that the construction permits of forming a unit as shown inFig. 1, of which one or more can be used in a suitable frame, and whichare independent of each other and can be removed quite readily, as aunit, from the frame. The unit shown in Fig. 1 consists of the threeresistance element supports mounted on the bars 1. It will be noted thateach resistance support is removable independent of the other support orsupports by removing the screws 13. If desired, the side plates can bearc-welded to the bars, but would be non-removable. This independence ofthe units and the resistance element supports permits of easy assemblyand construction and also ease in removal and replacing any of theindividual parts should it be desired to make repairs to the completeddevice.

The insulating blocks 11 and 12 can be incorporated into a single unitblock ifdesired, but in that case the resistance element would be pushedand pulled through the holes therein in installing, and under someconditions would not be as convenient'as the separately formed blocks,but would be quite convenient where a bar resistance element .was used.To apply the section shown in Fig. 9, it is only necessary to form theedges of the insulating blocks 11 and 12 with grooves corresponding tothe pro'ecting lip.

It will e noted in Fig. 2 that the insulating blocks 11 and 12 arespaced apart slight- 1y, which ermits of suificient freedom between thelocks to prevent binding under contraction or expansion, for it will berecognized that in a device of thissort the blocks are subjected to avery high degree of heat, as the resistance elements 4 and 5 very oftenreach a red heat and not infrequently a bright red heat. The slightspace between the blocks, as shown in Fig. 2, has another advantage, inthat it permits the removal of any one of the blocks 11 or 12 withoutthe necessity of removing the adjacent block or blocks. If one or moreblocks should become broken, it is only necessary to remove the entireunit, as shown in Fig. 1, from the supporting frame and to lay the samehorizontally upon a table or bench and then remove the upper side plate3. Any one of the insulating blocks 11 or 12 can then be removed bypushing the balance of the blocks toward one or both ends of theremaining side frame so as to allow all slack adjacent the block to beremoved. This, I find, is sufficient. The slack referred to between theblocks and slight manipulation of the blocks, I find, is sufiicient topermit any one ofthe blocks to be removed without the necessity ofremoving the adjacent blocks or disturbing the resistance elements 4 or5.

' There will be modifications to the disclosure herein made, which willbe apparent to those skilled in the art, and, therefore, I

do not wish to be limited other than by my claims.

I claim:

1. A support for a resistance element comprising a plurality ofinsulating blocks having flat faces and two of its oppositely disposededges being stepped, a half groove 1D each stepped face, the surface ofthe groove being convexed to limit contact with the resistance element,metallic members'to hold the blocks against lateral, longitudinal andtransverse displacement with limited longitudinal movement and means tohold the metallic members in fixed relation.

2. A support for a resistance element comprising a plurality ofinsulating blocks forming an elongated structure and each block havingfiat edges and two of its op ositely disposed edges being stepped, ahall groove in the face of each stepped edge and having limited contactwith the resistance element, oppositely disposed metallic members to encircle the exterior edges of the blocks to hold them against lateral,transverse and longitudinal displacement and means to hold the metallicmembers in fixed relation.

3. A support for a resistance element comprising a plurality ofinsulating blocks having edges and two of its oppositely disposed edgesbeing stepped, a half groove in each stepped edge to receive theresistance element, oppositely disposed members formed up of sheet metalwith spaced projections to form a groove to receive the insulatingblocks and hold them against lateral and transverse displacement andhaving inwardly projecting means at the ends of the members to preventlongitudinal dis lacement of the blocks and means to secure t e memberstogether in fixed relation.

4. A support for a resistance element comprising a plurality ofcooperating insulating blocks having flat faces and two of its oppositeldisposed edges being stepped and a ha f groove in the face of each stepto cooperate with the half oove in the face of each step in one of t ecooperating blocks to form a substantially complete circular groove toreceive and retain the resistance element and channeled means toreceiveo positely disposed ed es of the blocks to old the blocks in assem ledrelation and means to hold the channeled means in fixed relation.

5. An insulated support comprisin a pair of spaced and channeled membersorming an elongated recess with the groove of each member facing that ofthe other member, means to hold the members in fixed relation. and aplurality of insulating blocks positioned within the recess and oovesand locked thereby against lon itu inal and transverse movement, some oft e blocks having two oppositely disposed stepped edges and each step ofeach edge having a half groove to co operate with the half groove in theedge of the adjacent block to receive a resistance element.

In testimony whereof I aflix my si ature.

PLINY P. P PES.

